List of threatened historic sites in the United States

This article provides a List of threatened historic sites in the United States. A site is deemed historic if it has been listed on the National Register of Historic Places or an official State or Local landmark list. While there are many historic places in the U.S. that are not listed in an official government listing of landmarks, the purpose of this article is to report threats only to government-listed landmarks. A site is deemed threatened for this article if there is verifiable information that it is threatened. Documentation may include:

The SS United States, a passenger liner built in 1952 for the United States Lines. She captured the Blue Riband on its maiden voyage in 1952 — with the fastest eastbound and westbound transatlantic crossings record of three days, twelve hours, and twelve minutes. To this day she holds the fastest westbound transit record, some 57 years later. The ship's fate is unknown and has been in disregard for many years since her retirement in 1969.

World Monuments Fund covers a top 100 list worldwide, several of which in the United States. For example, following Hurricane Katrina, it lists New Orleans as a whole, which includes many NRHP sites. Of the NRHPs in New Orleans, some in low-lying areas were damaged by Katrina and remain threatened while others in the French Quarter and elsewhere were not and are not.

^The National Park Service reports "A draft Environmental Impact Statement has been released for the Highwood Generating Station. The station is a 250-megawatt, Circulating Fluidized Bed, coal-fired power plant with 6-megawatt of wind generation. Sections of the water intake and wastewater lines, overhead electric transmission lines, and the rail spur are proposed to be constructed within the NHL boundaries. Because this NHLs integrity is based on visual landscape qualities, the facilities planned present a high likelihood of negatively impacting the significant historic scene."